Altered implicit category learning in anorexia nervosa.

Abstract:

OBJECTIVE:Recent research has identified specific cognitive deficits in patients with anorexia nervosa (AN), including impairment in executive functioning and attention. Another such cognitive process, implicit category learning has been less studied in AN. This study examined whether implicit category learning is impaired in AN. METHOD:Twenty-one women diagnosed with AN and 19 control women (CW) were administered an implicit category learning task in which they were asked to categorize simple perceptual stimuli (Gabor patches) into one of two categories. Category membership was based on a linear integration (i.e., an implicit task) of two stimulus dimensions (orientation and spatial frequency of the stimulus). RESULTS:AN individuals were less accurate on implicit category learning relative to age-matched CW. Model-based analyses indicated that, even when AN individuals used the appropriate (i.e., implicit) strategy they were still impaired relative to CW who also used the same strategy. In addition, task performance in AN patients was worse the higher they were in self-reported novelty seeking and the lower they were in sensitivity to punishment. CONCLUSIONS:These results indicate that AN patients have implicit category learning deficits, and given this type of learning is thought to be mediated by striatal dopamine pathways, AN patients may have deficits in these neural systems. The finding of significant correlations with novelty seeking and sensitivity to punishment suggests that feedback sensitivity is related to implicit learning in AN.

journal_name

Neuropsychology

journal_title

Neuropsychology

authors

Shott ME,Filoteo JV,Jappe LM,Pryor T,Maddox WT,Rollin MD,Hagman JO,Frank GK

doi

10.1037/a0026771

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

191-201

issue

2

eissn

0894-4105

issn

1931-1559

pii

2011-29862-001

journal_volume

26

pub_type

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